I have experience with the company and partially the product;
In my experience Scott at SACC restorations sells quality products that he has tested for fit and function and stands behind with great customer service.
I purchased a very early version of the CNC Performance ZF cable shifter adapter prior to SACC carrying the product. It was well made and functioned as designed to.
I chose to use an in cab shifter assembly from a Toyota Tercel, which is visually the same as Superformance uses (and very similar to the CNC unit), the Superformance unit mounted in a custom steel cable mount. If you are able to fabricate the Toyota unit is a cheap alternative, I got several from my local Pick & Pull at the time for $50 and passed them on here.
Input from anyone who has changed from stock Superformance to one of the SACC units would be testament to the CNC unit over the Toyota.
Julian